DATAMATH CALCULATOR MUSEUM
|This TI-40 was manufactured
in October 1981 by
Texas Instruments in Abilene, TX (Date code ATA 4581 » wk 45 yr 1981.
|The printed circuit board
(PCB) of this TI-40 manufactured
in October 1981 with the CD4557 calculator circuit.
manufactured a few weeks earlier in Italy
uses the CD4507 calculator chip.
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© Joerg Woerner, October 9, 2002. No reprints without written permission.